Granted. You heal completly from any injury that is not instantly lethal. But while this also regenerates the brain, it regenerates it into newborn state.
Any memory (including knowledge) you have is guaranteed to be forgotten in 200years from forming. Unused skills are also forgotten in this fashion, but used ones are not, because when a fraction of a used skill is forgotten, when you use the skill you relearn the fraction.
This all is known, because you are caught 50 years after the wish being granted and studied for 400years. Apparently people noticed that you do not age.
I wish to be able to create temporary wormholes between any 2 places I have been to of my choosing, that are bound to the same gravitational field, when and only when I want to. The wormhole's entrances are circular, have a circular rim right aroun them and can not spawn (even partially) within solid objects or liquids. If the target location of at least one entrance is submerged in liquid or there is a large solid object there, instead of creating the wormhole I suddenly know which entrance was blocked and whether by liquid or solid object.
If an entrance is blocked by solid objects or drops of water, neither of which have more than 1cm3, they are displaced slightly to not be cut by the entrance.
This wormhole does not allow traveling to the past and when walking through it, you travel to the future at the rate of 1s/1s.